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Recommit r318963 "[APInt] Don't print debug messages from the APInt knuth division algorithm by default"

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The previous commit had the condition in the do/while backwards.

Debug builds currently print out low level details of the Knuth division algorithm when -debug is used. This information isn't useful in most cases and just adds noise to the log.

This adds a new preprocessor flag to enable the prints in the knuth division code in APInt.

Differential Revision: https://reviews.llvm.org/D40404

llvm-svn: 318966
This commit is contained in:
Craig Topper 2017-11-24 20:29:04 +00:00
parent 44ad6e2d33
commit 8d5c529d1f
1 changed files with 10 additions and 0 deletions
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10
lib/Support/APInt.cpp
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@ -1252,6 +1252,14 @@ static void KnuthDiv(uint32_t *u, uint32_t *v, uint32_t *q, uint32_t* r,
// b denotes the base of the number system. In our case b is 2^32.
const uint64_t b = uint64_t(1) << 32;
// The DEBUG macros here tend to be spam in the debug output if you're not
// debugging this code. Disable them unless KNUTH_DEBUG is defined.
#pragma push_macro("DEBUG")
#ifndef KNUTH_DEBUG
#undef DEBUG
#define DEBUG(X) do {} while (false)
#endif
DEBUG(dbgs() << "KnuthDiv: m=" << m << " n=" << n << '\n');
DEBUG(dbgs() << "KnuthDiv: original:");
DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
@ -1391,6 +1399,8 @@ static void KnuthDiv(uint32_t *u, uint32_t *v, uint32_t *q, uint32_t* r,
DEBUG(dbgs() << '\n');
}
DEBUG(dbgs() << '\n');
#pragma pop_macro("DEBUG")
}
void APInt::divide(const WordType *LHS, unsigned lhsWords, const WordType *RHS,